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Commit b99dbe56 authored by Tomas Henzl's avatar Tomas Henzl Committed by Martin K. Petersen
Browse files

megaraid_sas: Add an i/o barrier 



A barrier should be added to ensure proper ordering of memory mapped
writes.

Signed-off-by: default avatarTomas Henzl <thenzl@redhat.com>
Reviewed-by: default avatarKashyap Desai <kashyap.desai@broadcom.com>
Acked-by: default avatarKashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 19db2307

drivers/scsi/megaraid/megaraid_sas_base.c

+1 −0
Original line number Diff line number Diff line
@@ -749,6 +749,7 @@ megasas_fire_cmd_skinny(struct megasas_instance *instance, 
	       &(regs)->inbound_high_queue_port);

	writel((lower_32_bits(frame_phys_addr) | (frame_count<<1))|1,

	       &(regs)->inbound_low_queue_port);

	mmiowb();

	spin_unlock_irqrestore(&instance->hba_lock, flags);

}

drivers/scsi/megaraid/megaraid_sas_fusion.c

+1 −0
Original line number Diff line number Diff line
@@ -204,6 +204,7 @@ megasas_fire_cmd_fusion(struct megasas_instance *instance, 
		&instance->reg_set->inbound_low_queue_port);

	writel(le32_to_cpu(req_desc->u.high),

		&instance->reg_set->inbound_high_queue_port);

	mmiowb();

	spin_unlock_irqrestore(&instance->hba_lock, flags);

#endif

}